Minerals are classified on the basis of their chemical composition. which of course is expressed by their physical properties these include color, crystal form,hardness,density,luster,and cleavage.
There are two main classifications of minerals. Major minerals are minerals your body needs in relatively large (or major) quantities, and trace minerals are minerals your body needs in relatively small (or trace) quantities. Major minerals include sodium, potassium, chloride, calcium, phosphorus, magnesium and sulfur.
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